Before 2019, some coronaviruses circulated in the population. They are the human coronaviruses 229E, NL63, OC43, and HKU1. The SARS-Cov-2 entered the scene in December 2019. Every time a virus infects anyone, it mutates and changes to find a way to survive. That’s because everybody’s immune system is different. The specificity and properties of an…
Should I be afraid of the omicron variant?
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